Data communication system and data communication method

Abstract

A data communication system and data communication method capable of drastically improving the quality of a dynamic image service to be offered to a user. The data communication system comprises a mobile communication terminal ( 1 - 2 ), an application server ( 1 - 1 ) for fetching data open to the public on a network ( 1 - 7 ) in accordance with a request from the mobile communication terminal ( 1 - 2 ) and conducting a data rate conversion for delivery to the mobile communication terminal ( 1 - 2 ) and conducting data delivery and transferring the fetched data to a predetermined transferred destination, and a home server ( 1 - 5 ) provided in a base of a possessor of the mobile communication terminal ( 1 - 2 ) for receiving the data, fetched by the application server ( 1 - 1 ) and transferred, through the network ( 1 - 7 ) and accumulating the data to regenerate the data as needed.

1. A data communication system comprising:
 a home server; 
 a mobile communication terminal transmitting a request signal including request information for delivering data stored in a data source in a network to said mobile communication terminal, and request information for transferring the data to said home server; 
 an application server fetching data open to a public on the network, conducting a data rate conversion for delivery to said mobile communication terminal and conducting data delivery, and transferring the fetched data to said home server, in accordance with information included in the request signal from said mobile communication terminal, wherein said application server fetches requested data requested in the request signal, and the fetched data is of a highest bit rate amount among a plurality of kinds of requested data stored in the data source with bit rates different from each other; 
 said application server includes:
 a fetching unit fetching the data open to the public on said network in accordance with a request from said mobile communication terminal; 
 a first data rate conversion delivery unit conducting a conversion on the data, fetched by said fetching unit, into a data rate for the delivery to said mobile communication terminal and conducting the delivery to said mobile communication terminal; and 
 a transferring unit for transferring the data, fetched by said fetching unit, to said home server, and 
 
 said home server comprises:
 an accumulation processing unit accumulating the data, transferred from said application server, in a storage area; and 
 a regenerating unit regenerating the data accumulated in said storage area; and 
 
 said home server receives data from said application server fetched and transferred through said network, and accumulates received data, wherein 
 said mobile communication terminal comprises a delivery request signal outputting unit outputting, to said application server, a delivery request signal designating a location of delivery-requested data on said network and a location of said home server which is a transferred destination, and 
 said transferring unit transfers the data, fetched by said fetching unit, to said home server on the basis of said delivery request signal from said delivery request outputting unit of said mobile communication terminal. 
 
   
   
     2. The data communication system according to  claim 1 , wherein said application server comprises:
 a calling unit calling the data, accumulated in said home server, in accordance with a request from said mobile communication terminal; and 
 a data rate conversion delivery unit, upon receipt of the data called by said calling unit from said home server, conducting a data rate conversion for the delivery to said mobile communication terminal and conducting the delivery to said mobile communication terminal, and 
 said home server comprises:
 a reply processing unit reading out the data, called by said calling unit of said application 
 server, from said storage area and making a reply. 
 
 
   
   
     3. The data communication system according to  claim 1 , wherein a plurality of home servers are provided as said home server and a designation information on a home server which is a transferred destination is included in said request from said mobile communication server. 
   
   
     4. The data communication system according to  claim 1 , wherein said transferring unit of said application server comprises:
 a traffic monitoring unit monitoring a network traffic with respect to said home server; and 
 an under-monitor transferring unit transferring the data, fetched by said fetching unit, to said home server in accordance with a result of the monitor of the traffic with respect to said home server by said traffic monitoring unit. 
 
   
   
     5. A data communication method comprising:
 outputting a request signal from a mobile communication terminal, the request signal including request information for delivering data stored in a data source in a network to said mobile communication terminal, and request information for transferring the data to a home server; 
 fetching the data corresponding to said request, and conducting a data rate conversion on the data for delivery to said mobile communication terminal and conducting the delivery in an application server; 
 transferring the data, fetched by said application server, to said home server; 
 receiving data transferred and accumulating received data, in said home server, 
 fetching the data open to the public on said network in accordance with a request from said mobile communication terminal; 
 conducting a conversion on the fetched data into a data rate for the delivery to said mobile communication terminal and conducting the delivery to said mobile communication terminal; and 
 transferring the fetched data to said home server, and 
 said home server:
 accumulates the data, transferred from said application server, in a storage area; 
 regenerates the data accumulated in said storage area; and 
 receives data from said application server fetched and transferred through said network, and accumulates received data, 
 
 wherein said application server fetches requested data requested in the request signal, and the fetched data is of a highest bit rate among a plurality of kinds of requested data stored in the data source with bit rates different from each other, said mobile communication terminal outputs a delivery request signal outputting, to said application server, a delivery request signal designating a location of delivery-requested data on said network and a location of said home server which is a transferred destination, and transferring the data fetched by said application server to said home server on the basis of said delivery request signal from said mobile communication terminal. 
 
   
   
     6. The data communication method according to  claim 5 , wherein the data fetched is transferred to said home server after a bit rate conversion in accordance with communication environments of said application server and said home server. 
   
   
     7. The data communication method according to  claim 5 , wherein, a network traffic between said application server and said home server is monitored in said application server and the data fetched is transferred to said home server in accordance with a result of the traffic monitor. 
   
   
     8. The data communication method according to  claim 5 , further comprising:
 in said application server, calling the data, accumulated in said home server, in accordance with a request from said mobile communication terminal; 
 in the home server, reading out the data called from said storage area to make a reply to said application server; and 
 in said application server, upon receipt of the data of the reply from said home server, conducting a data rate conversion on the reply data for delivery to said mobile communication terminal, and conducting the delivery to said mobile communication terminal.